code: def test_acer(policy):
      """
      test ACER on atari
  
      :param policy: (str) the policy to test for ACER
      """
      acer_atari.train(
          env_id=ENV_ID,
          num_timesteps=NUM_TIMESTEPS,
          seed=SEED,
          policy=policy,
          lr_schedule="constant",
          num_cpu=NUM_CPU,
      )
  
file_path: stable-baselines/tests/test_atari.py
imports: import pytest
  from stable_baselines import bench, logger
  from stable_baselines.deepq import DQN, wrap_atari_dqn, CnnPolicy
  from stable_baselines.common import set_global_seeds
  from stable_baselines.common.atari_wrappers import make_atari
  import stable_baselines.a2c.run_atari
  import stable_baselines.acer.run_atari
  import stable_baselines.acktr.run_atari
  import stable_baselines.ppo1.run_atari
  import stable_baselines.ppo2.run_atari
  import stable_baselines.trpo_mpi.run_atari
label_desc: Use image node_id 2 for calling a global function with example usage: test_acer(policy) without return types